Pokémon the Movie: Secrets of the Jungle

In the dense Forest of Okoya, a boy named Koko has been raised in the wild by a Mythical Pokémon called Zarude, living as one of the Pokémon despite not having any special abilities. Koko believes he is a Pokémon, unaware of his human nature. When Ash Ketchum and his companion Pikachu arrive in the forest, they encounter Koko and join forces with him to defend the Great Tree, a vital part of the forest's ecosystem, from Dr. Zed, a scientist whose unethical experiments threaten the natural balance.